Cry about Liberal being boor (4)
I believe the answer is:
slob
'being boor' is the definition.
(I've seen this in another clue)
'cry about liberal' is the wordplay.
'cry' becomes 'sob' (sobbing is a kind of crying).
'about' indicates putting letters inside.
'liberal' becomes 'l' (abbreviation).
'sob' enclosing 'l' is 'SLOB'.
(Other definitions for slob that I've seen before include "Fat, idle type" , "Boor" , "Slovenly, dirty type" , "Slovenly person (colloq.)" , "Untidy and lazy person" .)